Aodh: Use the coordination class to define backend

... instead of the deprecated coordination_url parameter[1].

[1] 16091c8dd6f97f55fb7875e7843f3de7017a99ce

Change-Id: Icab23acb0a70c46d776f38e000efed7805ea2228

manifests/aodh.pp

@@ -88,8 +88,10 @@ class openstack_integration::aodh (
   class { 'aodh::client': }
   class { 'aodh::notifier': }
   class { 'aodh::listener': }
+  class { 'aodh::coordination':
+    backend_url => $::openstack_integration::config::tooz_url,
+  }
   class { 'aodh::evaluator':
-    coordination_url    => $::openstack_integration::config::tooz_url,
     evaluation_interval => 10,
   }
   class { 'aodh::expirer': }